1,1-Diphenylalkenes. Part II. Alkylation of 1,1-diphenylpropene carbanions. The principle of least motion
作者:R. Boyce、W. S. Murphy、K. P. Klein
DOI:10.1039/p19720001292
日期:——
Carbanions of the type [Ph2CCHCHR]– were alkylated in liquid ammonia. A preponderance of α-alkylation occurred when R was H or Me, in accord with the principle of leastmotion. Contrary to predictions, exclusive α-alkylation occurred when R was Ph. The mechanism and synthetic utility of these reactions are discussed.
Carbonium ion rearrangements controlled by the presence of a silyl group
作者:Ian Fleming、Shailesh K Patel
DOI:10.1016/s0040-4039(01)92922-3
日期:——
Tertiary alcohols with a λ-silyl group (3) generally undergo a simple carboniumionrearrangement in acid giving a single alkene product (4) with loss of the silyl group.
Photochemistry of two diphenyl β,γ-enones and a series of methyl- and phenyl-substituted α-phenyl ketones
作者:Margareth J. C. M. Koppes、Astrid M. Crabbendam、Hans Cerfontain
DOI:10.1002/recl.19881071205
日期:——
The photochemistry of the diphenylβ,γ-enones 2 and 3 and the methyl- and phenyl-substitutedα-phenylketones 4-9 has been studied, using mainly benzene as solvent. Irradiation of 2 with λ 300 nm leads to the 1,3-acyl shift (1,3-AS) product 17, relatively small amounts of the decarbonylation products 15 and 16, and the photo-oxidation products benzophenone (18) and the α,β-unsaturated aldehyde 19.
carboxylation with CO2 is a powerful strategy for the synthesis of functionalized carboxylic acids and their derivatives under mild conditions. However, the dicarboxylation of alkenes with CO2 is still underdeveloped and confined to the formation of only two C–C bonds. Herein, we report the 1,3-dicarboxylation of unactivated alkenes with CO2 via 1,2-arylmigration, which involves the cleavage of one C–C bond
CO 2光催化羧化是在温和条件下合成官能化羧酸及其衍生物的有力策略。然而,烯烃与CO 2的双羧化反应仍不发达,且仅限于仅形成两个C-C 键。在此,我们报道了未活化的烯烃通过1,2-芳基迁移与CO 2 发生1,3-二羧基化,其中涉及一个C-C键的断裂和三个C-C键的形成。这种可见光光催化方案还具有良好的官能团耐受性、广泛的底物范围以及易于将产物衍生为杂环支架的特点。机理研究表明,原位生成的甲酸盐可以作为CO 2 ˙−的自由基前体,随后的自由基加成、1,2-芳基迁移、单电子还原以及对第二个CO 2的亲核攻击将得到二羧酸。
Fleming, Ian; Patel, Shailesh K.; Urch, Christopher J., Journal of the Chemical Society. Perkin transactions I, 1989, p. 115 - 124
作者:Fleming, Ian、Patel, Shailesh K.、Urch, Christopher J.